[PATCH -next] crypto: curve25519 - Fix selftests build error

[YueHaibing <yuehaibing@xxxxxxxxxx>]

If CRYPTO_CURVE25519 is y, CRYPTO_LIB_CURVE25519_GENERIC will be
y, but CRYPTO_LIB_CURVE25519 may be set to m, cause build errors:

lib/crypto/curve25519-selftest.o: In function `curve25519':
curve25519-selftest.c:(.text.unlikely+0xc): undefined reference to `curve25519_arch'
lib/crypto/curve25519-selftest.o: In function `curve25519_selftest':
curve25519-selftest.c:(.init.text+0x17e): undefined reference to `curve25519_base_arch'

This splits the curve25519 test code into its own source file.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: aa127963f1ca ("crypto: lib/curve25519 - re-add selftests")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 lib/crypto/Makefile              |  6 +++++-
 lib/crypto/curve25519-selftest.c | 23 ++++++++++++++++++++++-
 lib/crypto/curve25519.c          | 17 -----------------
 3 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile
index f97f9b94..87c99da 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -36,5 +36,9 @@ libsha256-y					:= sha256.o
 ifneq ($(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS),y)
 libblake2s-y					+= blake2s-selftest.o
 libchacha20poly1305-y				+= chacha20poly1305-selftest.o
-libcurve25519-y					+= curve25519-selftest.o
+ifneq ($(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519),)
+obj-$(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519)	+= curve25519-selftest.o
+else
+obj-$(CONFIG_CRYPTO_LIB_CURVE25519_GENERIC)	+= curve25519-selftest.o
+endif
 endif
diff --git a/lib/crypto/curve25519-selftest.c b/lib/crypto/curve25519-selftest.c
index c85e853..c4cfa26 100644
--- a/lib/crypto/curve25519-selftest.c
+++ b/lib/crypto/curve25519-selftest.c
@@ -4,6 +4,8 @@
  */
 
 #include <crypto/curve25519.h>
+#include <linux/module.h>
+#include <linux/init.h>
 
 struct curve25519_test_vector {
 	u8 private[CURVE25519_KEY_SIZE];
@@ -1280,7 +1282,7 @@ static const struct curve25519_test_vector curve25519_test_vectors[] __initconst
 	}
 };
 
-bool __init curve25519_selftest(void)
+static bool __init curve25519_selftest(void)
 {
 	bool success = true, ret, ret2;
 	size_t i = 0, j;
@@ -1319,3 +1321,22 @@ bool __init curve25519_selftest(void)
 
 	return success;
 }
+
+static int __init mod_init(void)
+{
+	if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&
+	    WARN_ON(!curve25519_selftest()))
+		return -ENODEV;
+	return 0;
+}
+
+static void __exit mod_exit(void)
+{
+}
+
+module_init(mod_init);
+module_exit(mod_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Curve25519 selftest");
+MODULE_AUTHOR("Jason A. Donenfeld <Jason@xxxxxxxxx>");
diff --git a/lib/crypto/curve25519.c b/lib/crypto/curve25519.c
index c03ccdb..0106beb 100644
--- a/lib/crypto/curve25519.c
+++ b/lib/crypto/curve25519.c
@@ -13,8 +13,6 @@
 #include <linux/module.h>
 #include <linux/init.h>
 
-bool curve25519_selftest(void);
-
 const u8 curve25519_null_point[CURVE25519_KEY_SIZE] __aligned(32) = { 0 };
 const u8 curve25519_base_point[CURVE25519_KEY_SIZE] __aligned(32) = { 9 };
 
@@ -22,21 +20,6 @@ EXPORT_SYMBOL(curve25519_null_point);
 EXPORT_SYMBOL(curve25519_base_point);
 EXPORT_SYMBOL(curve25519_generic);
 
-static int __init mod_init(void)
-{
-	if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&
-	    WARN_ON(!curve25519_selftest()))
-		return -ENODEV;
-	return 0;
-}
-
-static void __exit mod_exit(void)
-{
-}
-
-module_init(mod_init);
-module_exit(mod_exit);
-
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Curve25519 scalar multiplication");
 MODULE_AUTHOR("Jason A. Donenfeld <Jason@xxxxxxxxx>");
-- 
2.7.4